Is your msd equipment a new install? If so did you have to install a diode to get it to shut off? i installed a new ready to run msd in my 69 gto and mistakingly installed the diode in the wrong alternator wire, facing the wrong way to boot. the car would shut off but was not allowing the battery to charge while driving, also the msd needs the 12 volts to operate and sometimes before the battery drained it acted like the msd was going haywire, which it was because my battery wasnt supplying enough voltage. shut me down on the road several times and drove me nuts. clued in and swapped the diode to correct install and the world was right again.
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